hash stringlengths 32 32 | doc_id stringlengths 7 13 | section stringlengths 3 121 | content stringlengths 0 2.2M |
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f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.5.5 extensions | The extensions property allows application-specific metadata (contained in a concrete subclass of the Extension class) to be associated with the Program. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.6 Entities | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.6.1 General | Each Entity instance SHALL correspond to an entity on the Program timeline, associated with a start offset (inclusive) and an end offset (exclusive), defining the Entity Time Window. The end offset SHALL be larger than the start offset. The duration of an entity SHALL be the positive difference by end offset and start ... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.6.2 id | The id property allows multiple related Entities to be uniquely linked within the scope of the Program as belonging to the same Object (see Clause 4.3). The following constraints apply: • No two Entity instances belonging to the same Audio Object SHALL overlap on the timeline. In other words, an Audio Object SHALL be p... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.6.3 extensions | The extensions property allows application-specific metadata (contained in concrete subclasses of the Extension class defined by the application) to be associated with an Entity. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.7 Group | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.7.1 General | A Group instance is a logical group of Entity instances. The Type of a Group instance is GroupType. Figure 4.9: Group Model The start offset of a Group instance SHALL be the smallest start offset of all Entity instances it contains. The end offset of a Group instance SHALL be the largest end offset of all Entity instan... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.8 Switch | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.8.1 General | Figure 4.10: Switch Model A Switch instance is a logical group of Entity instances, one of which SHALL be designated as default and the others designated as alternates. The Type of a Switch instance is SwitchType. The start offset of a Switch instance SHALL be the smallest start offset of all Entity instances it contai... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.9 Fragment | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.9.1 General | A Fragment represents an Entity that spans a specified interval of the Program timeline. Figure 4.11: Fragment Object Model The start offset of a Fragment instance shall be the value of its offset property. The end offset of a Fragment instance shall be the sum of the values of its offset and duration properties. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.9.2 offset property | The value of the offset property SHALL be in the range [0, 264-1]. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.9.3 duration property | The duration property SHALL be in the range [0, 216-1]. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.10 MonoSourceFragment | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.10.1 General | A MonoSourceFragment represents a monaural sound source whose characteristics are constant over the duration of the MonoSourceFragment. ETSI ETSI TS 103 223 V1.1.1 (2015-04) 19 Figure 4.12: MonoSourceFragment Object Model |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.10.2 audioEssence | The audioEssence property SHALL reference the audio samples of the monaural sound source. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.10.3 gain | The gain property specifies a gain that is applied to the source audio samples. It allows the relative gain of sources to be adjusted without modifying the latter. In particular, this property allows the re-use of audioEssence at different gain levels. Note that values larger than 0 may lead to clipping and need to be ... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.11 ObjectFragment | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.11.1 General | An ObjectFragment instance represents a monaural sound source that can be positioned within the soundfield. The Type of an ObjectFragment is ObjectType. Figure 4.13: ObjectFragment Object Model The extent of the ObjectFragment is parameterized by aperture and divergence values. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.11.2 position | The position property SHALL be the position of the sound source. ETSI ETSI TS 103 223 V1.1.1 (2015-04) 20 |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.11.3 aperture | Figure 4.14: 15° aperture shown using stereographic projection The aperture property shall be the nominal extent of the sound source before the application of divergence (see Clause 4.5.11.4). The nominal extent is the spherical cap defined by the intersection of (i) the sphere whose radius is the segment between the p... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.11.4 divergence | The divergence property shall be the half angle of the horizontal arc (latitude) centered at the sound source location over which the nominal extent is spread to yield the source extent. Figure 4.15 illustrates a 45° divergence applied to a 0° and 15° aperture. The following constraints apply: • The divergence property... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.11.5 coherent | The coherent property SHALL indicate whether the source is rendered coherently (coherent equal to 1) or diffusively (coherent equal to 0) across its extent. The following constraints apply: • The value of coherent SHALL be in the set {0, 1}. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.11.6 renderingExceptions | A soundfieldName MAY be associated with an MDA reference renderer instance and is typically set at renderer initialization (e.g. using a configuration file). If the targetConfiguration property of a RenderingException instance matches the target renderer soundfieldName, the normative MDA VBAP renderer is overridden, an... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.11.7 contentKind | The contentKind property indicates the audio content of the ObjectFragment. The present document defines three values (<AudioContentKindDialog>, <AudioContentKindEffects>, and <AudioContentKindMusic>), but applications MAY add other values (see Table 4.2). Implementations may ignore values they do not recognize. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.12 LFEFragment | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.12.1 General | An LFEFragment instance represents a low-frequency effects sound source. The Type of an LFEFragment is LFEType. A Slice may contain 0, 1 or more LFEFragment instances. However, applications may restrict the number of allowed simultaneous LFEFragment instances. Figure 4.16: LFEFragment Object Model |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.13 AudioSamples | An AudioSamples instance selects a sequence of audio samples from an underlying asset. Figure 4.17: AudioSamples Object Model assetOffset[0..1] : integer = 0 assetURI[1] : URI AudioSamples ETSI ETSI TS 103 223 V1.1.1 (2015-04) 22 |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.13.1 assetOffset | The assetOffset property SHALL indicate the offset of the first audio sample selected within the asset referenced by the assetURI property. The following constraints apply: • The value of the assetOffset property SHALL be in the range [0, 264-1] in units of audio samples. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.13.2 assetURI | The assetURI property shall reference a sequence of audio samples. The nature of the reference is left to specifications mapping the MDA Program to bitstreams. For instance, the reference can be either internal or external to the bit stream. The following constraints apply: • No two sequences of audio samples SHALL hav... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.14 RenderingException | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.14.1 General | The RenderingException class allows the author to override default VBAP rendering behaviour in the presence of the rendering configurations listed in the targetConfiguration property. Each concrete subclasses of the RenderingException class shall specify a specific rendering behaviour. Figure 4.18: RenderingException O... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.14.2 targetConfiguration property | The targetConfiguration property holds a valid soundfieldName or NULL (see Clause 5.2.1.1) and SHALL indicate the rendering configuration to which the RenderingException instance shall apply (see Clause 5.3.2) |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.15 PositionRenderingException | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.15.1 General | The PositionRenderingException allows the author to indicate an alternate position for the object, as specified by the PositionRenderingException.position property. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.15.2 position | The position property SHALL be the alternate position of the ObjectFragment instance for which the RenderingException instance applies. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.16 ChannelRenderingException | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.16.1 General | The ChannelRenderingException allows the author to explicitly specify the channels to which the object waveform is routed, when rendering to specified target rendering configuration. ETSI ETSI TS 103 223 V1.1.1 (2015-04) 23 |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.16.2 gains | Each item of the gains property specifies an output channel (specified by ChannelGain.channel) to which the audio samples of the object are routed after applying a gain (specified by the ChannelGain.gain). If the gains property contains no elements, the rendering of the ObjectFragment instance is suppressed. The follow... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.17 ChannelGain | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.17.1 General | A ChannelGain instance associates a gain with an audio channel. Figure 4.19: ChannelGain Object Model |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.17.2 gain property | The value of the gain property SHALL belong to the set [-255,0]/4 and SHALL be in units of dB. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.17.3 channel property | The channel property indicates the audio channel to which the gain property applies. The LFE channel SHOULD NOT appear in channel rendering exceptions. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.18 Extension | The Extension class is abstract. Application-specific metadata is added to the Program by defining concrete subclasses. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.19 Position | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.19.1 General | A Position instance represents a position in the coordinate system specified in Clause 4.4. Figure 4.20: Position Object Model |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.19.2 radius | The value of the radius property shall correspond to the ρ coordinate of the position, i.e. the radial distance. The following constraints apply: • The radius property SHALL take values in the set [0,4 095]/2 047. radius[0..1] : rational = 1 azimuth[0..1] : rational = 0 elevation[0..1] : rational = 0 Position ETSI ETSI... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.19.3 azimuth | The azimuth property shall correspond to the θ coordinate of the position. The following constraints apply: • The value of the azimuth property SHALL be in the set [-2 048,2 047]×(180/2 048) in units of degrees (and in the corresponding set in units of radians). |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.5.19.4 elevation | The value of the elevation property SHALL correspond to the ϕ coordinate of the position. The following constraints apply: • The value of the elevation property SHALL be in the set [-1 023,1 023]×(90/1 023) in units of degrees (and in the corresponding set in units of radians). |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.6 Overall Constraints | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.6.1 Aligned Fragment Instances | Entity intervals SHALL be mutually disjoint, i.e. two different intervals SHALL NOT overlap. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.7 URI Constants | Table 4.2 SHALL define URI constants used by the present document. Table 4.2: URI Constants Symbol URI Definition Content Kind AudioContentKindDialog <mdacore>/labels/content- kind/dialog Any spoken words or narration, including unidentifiable human vocalizations e.g. crowd walla or cheers. AudioContentKindEffects <mda... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.8 Basic Data Types | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.8.1 General | The present document makes use of the following data types. No assumption is made on their encoding. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.8.2 Real | The real data type shall consist of all real numbers. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.8.3 Rational | The rational data type shall consist of all rational numbers. ETSI ETSI TS 103 223 V1.1.1 (2015-04) 25 |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.8.4 Integer | The integer data type shall consist of all integer numbers. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 4.8.5 URI | The URI data type shall be a URI as specified in RFC 3986 [1]. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 5 MDA Reference Renderer | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 5.1 Overview | The reference renderer, illustrated in Figure 5.1, operates on successive offsets in the Program timeline. With the exception of two functions whose definition is outside of the scope of the present document and are free parameters of the MDA Reference Renderer, i.e. ApplyDecorrelation and ApplySmoothing, the reference... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 5.2 Configuration | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 5.2.1 General | The Configuration structure holds the information necessary for the reference renderer to render MonoSourceFragment instances to loudspeakers. With the exception of virtualSources, which is generated, all information needs to be provided as input to the rendering process. Following UML conventions, the absence of a pro... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 5.2.2 soundfieldName | If not NULL, Configuration.soundfieldName SHALL identify the speaker configuration embodied by the combination of Configuration.speakers and Configuration.lfe (see Clause 5.2.1.2). As specified in Clause 4.5.11.6 and Clause 5.3.2, the Configuration.soundfieldName is used to match against the targetConfigurations proper... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 5.2.3 Speakers | Two kinds of loudspeakers can be specified, normal and Low Frequency Effects (LFE), corresponding to Configuration.speakers and Configuration.lfe, respectively. An LFESpeaker is required to render LFEFragment instances. However, an LFESpeaker may be defined virtual (see below) with its input being rerouted to other Spe... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 5.2.4 patches | typedef int Patch [3]; A Patch instance is a triplet of speaker indices T=(m[1],m[2],m[3]), where each m[i] corresponds to a normal speaker position in the set of all speaker positions H. The patches property is an array of Patch instances. Let Plane[T] be the plane defined by the speaker locations in a Patch instance ... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 5.2.5 Virtual Sources | struct VirtualSource { Position position; float gains[]; }; To render extended sources, the reference renderer first renders a collection of point sources uniformly sampled over the unit sphere, and then averages over those virtual sources located within the source extent. The virtualSources property shall be computed ... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 5.3 Rendering Process | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 5.3.1 ProcessOffset | For every successive offset T within Program timeline, the reference renderer shall execute ProcessOffset(config, fragments, speakerOutput, lfeOutput), with: • config as specified in Clause 5.2. • fragments consisting of the MonoSourceFragment instances for which T lies within the time interval of MonoSourceFragment. •... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 5.3.2 Render Object Fragment | The RenderObjectFragment function renders an object with gains normalized to unit power. It returns the number of point sources used to rendering the object. int RendeObjectFragment( Configuration config, ObjectFragment fragment, float gains[]) { //assert: gains.size()=config.speakers.size() float output[config.speaker... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 5.3.3 RenderPatch | RenderPatch returns the contribution of a source located at cartesianPosition to each element of a triplet speakerPatch of speakers according to the Vector Base Amplitude Panning (VBAP) formalism [i.1]. A patch P such that RenderPatch(P,Q) returns a non-zero gain vector is said to render position Q. By construction, Re... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 5.3.4 Point Source Rendering | Applying RenderPatch for all available patches and subsequent averaging renders a point source. Only points in the convex hull of config.patches can be rendered. The number of patches used in rendering the point source is returned. By construction, RenderPointSource normalizes the linear combination of speaker position... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 5.4 Extent Rendering | Simultaneous rendering the pre-calculated virtual sources virtualSources of the configuration config renders an extended source. The function returns the number of virtual sources used for rendering. Only the intersection of the extent of fragment and the convex hull of config.patches can and will be rendered. int Rend... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6 MDA Core Bitstream | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.1 Introduction | The Bitstream consists of an ordered sequence of Packets. As illustrated in Figure 6.1, each Packet consists of a payload preceded by a Label field identifying the nature of the payload and a length field indicating the size of the payload. Packet are byte-aligned, but information within their payloads not necessarily ... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.2 Structures | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.2.1 General | The Bitstream syntax is expressed using the operation of a hypothetical parser using the structure specification language described in Annex A. For extensibility, the Bitstream syntax allows the presence of unknown Packets - captured by fields of type UnexpectedPacket. Implementations may safely ignore these unknown Pa... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.2.2 Bitstream | A Bitstream consists of an ordered sequence of Frames, as specified in Fragment 6.1. Each Frame is an item of the fFrame[] collection. The number of Frames in an MDA Bitstream for a given MDA Program SHALL be less than or equal to 264. Fragment 6.1: Bitstream Structure aligned struct Bitstream { var int i = 0; while(!e... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.2.3 Frame | A Frame SHALL correspond to an interval within a Program timeline, with the Program uniquely identified by the fFrameHeaderPacket.fId field. The MDA::Program.header object is specified by the fFrameHeaderPacket field. The audio samples required for the reproduction of the Frame MAY be contained in the fAssetFramePacket... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.2.4 Assets | An Asset Frame Packet contains a sequence of file-internal audio samples associated with the Frame. The content of Asset Frame Packet correspond the target of the assetURI property in the Core specification. For the present document the assetURI for an internal asset shall be of the form "urn:x-mda:bitstream:afid:<aid>... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.2.5 Slice Structure | A Slice contains zero or more Entities, contained in the fEntity[] field. The number of Entities in a Slice SHALL be less than or equal to 232. The start offset and duration of each Entity SHALL be equal to the start offset and duration of the Slice, respectively. The duration of the Slice SHALL be equal to the fSliceH... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.2.6 Entities | The fields of the Entity structure SHALL be mapped to concrete derived classes of the MDA::Entity abstract class. Table 6.1: Entity Fields to MDA Object Classes Entity Field MDA Object Class Entity.fObjectFragment MDA::ObjectFragment Entity.fLFEFragment MDA::LFEFragment Entity.fGroup MDA::Group Entity.fSwitch MDA::Swit... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.2.7 LFEFragment | An LFEFragment structure corresponds to a single MDA::LFEFragment instance. Fragment 6.5: LFEFragment Structure Syntax aligned struct LFEFragment { LFEFragmentPacket fLFEFragmentPacket; } The fLFEFragmentPacket SHALL be mapped to the MDA::LFEFragment object. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.2.8 ObjectFragment | An ObjectFragment structure corresponds to a single MDA::ObjectFragment instance. Fragment 6.6: ObjectFragment Structure Syntax aligned struct ObjectFragment { ObjectFragmentPacket fObjectFragmentPacket; } The fObjectFragmentPacket shall be mapped to the MDA::ObjectFragment object. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.2.9 Group | A Group structure corresponds to a single MDA::Group instance. Fragment 6.7: Group Entity Structure aligned struct Group { GroupStartPacket fGroupStartPacket; // Group Members var int i = 0; while(! eof) { peek PacketHeader fUnknownHeader; // End of Group if (fUnknownHeader.fKind == GroupEndPacket.fKind) { GroupEndPack... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.2.10 Switch | A Switch structure corresponds to a single MDA::Switch instance. Fragment 6.8: Switch Entity Syntax aligned struct Switch { SwitchStartPacket fSwitchStartPacket; // Members var int i = 0; while(! eof) { peek PacketHeader fUnknownHeader; // End of Switch if (fUnknownHeader.fKind == SwitchEndPacket.fKind) { SwitchEndPack... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.3 Packets | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.3.1 General | All Label values shall be URI values unless specified otherwise in the present document. ETSI ETSI TS 103 223 V1.1.1 (2015-04) 40 |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.3.2 Frame Header Packet | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.3.2.1 General | The FrameHeaderPacket signals the start of a Frame and contains information applicable to the Frame and Program as a whole. For this version of the Bitstream Specification the MDA::Program.header.constraintSets property SHALL be absent from a FrameHeaderPacket. Fragment 6.9: Frame Header Packet Structure aligned struct... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.3.2.2 fBitstreamVersion | The fBitstreamVersion field SHALL be equal to kBitstreamVersion=3 for a Bitstream conforming to the present document. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.3.2.3 fProgramNamespace | For the present document, the fProgramNamespace field SHALL be equal to <mdacore>. Table 6.2: Program Namespace Labels Symbol URI mdaroot http://mdaif.org mdacore http://mdaif.org/core/1.0 |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.3.2.4 fProgramURI | The fProgramURI field SHALL be equal to MDA::Program.header.programURI. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.3.2.5 fSampleRate | The fSampleRate field SHALL be equal to MDA::Program.header.sampleRate. Implementations SHALL support the values <48KHz> and <96KHz> as listed in Table 6.3. Table 6.3: Sample Rate Labels Constant URI 48 KHz <mdacore>/labels/sample-rate/48000Hz 96 KHz <mdacore>/labels/sample-rate/96000Hz ETSI ETSI TS 103 223 V1.1.1 (201... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.3.2.6 fExtensions | Each item of fExtensions field SHALL correspond to an item of the MDA::Program.header.extensions collection. The number of Extensions in a Frame Header Packet SHALL be less than or equal to 232. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.3.2.7 fOffset | The fOffset field SHALL be equal to the offset (in samples) of the time interval represented by the Frame within the Program timeline. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.3.2.8 fDuration | The fDuration field SHALL be equal to the duration of the time interval represented by the Frame, defined as the sum of all SliceHeaderPacket.fDuration values for the Slices within the Frame. |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.3.2.9 fCRC | The fCRC field SHALL be computed over all fields preceding the fCRC field using the 16-bit CRC specified in Figure 6.5, with all bits initialized to 1. The generating polynomial is x16 + x12 + x5 + 1. Figure 6.5: CRC_16 Algorithm The fCRC field can be used by implementations to reliably locate the start of a Frame in a... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.3.3 Asset Frame Packet | |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.3.3.1 General | Each AssetFramePacket contains a sequence of audio samples associated with the Frame. As illustrated in Figure 6.6, multiple Entities may reference audio samples within the same AssetFramePacket. Note that an AssetFramePacket does not correspond to MDA core concept. Fragment 6.10: Asset Frame Packet Structure aligned s... |
f952cb359110469a2c2e9d21522d74c4 | 103 223 | 6.3.3.2 fId | The fId field identifies the AssetFramePacket and shall be unique within the Frame. |
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